[Healeys] Lightened flywheels

[Michael Oritt]

I hesitate to nitpick but as to the statement that *"4 to 5 pounds off
vehicle weight is really only the equivalent of half a tank of fuel"  *the last
time I looked an AH fuel tank holds about 12 gallons and since gasoline
weighs approximately 7.5 lbs per gallon half a tank weighs about 45
pounds.  The defense rests....

Best--Michael Oritt

On Tue, Sep 7, 2021 at 6:00 PM richard mayor via Healeys <
healeys at autox.team.net> wrote:

> Michael,
>
> Comparing the weight of fuel in the gas tank to rotational mass is like
> comparing apples to bananas.
>
> Richard
>
>
> On Tue, Sep 7, 2021 at 2:24 PM Michael Salter <michaelsalter at gmail.com>
> wrote:
>
>> The total mass of the flywheel is not completely relevant insofar as
>> engine moment of inertia is concerned.
>> What is important is the mass removed times the square of the radius, so
>> just how much weight has been removed per se is not important.
>> Secondly removing rotational inertia is not always the best thing to do,
>> if it was you can be assured that manufacturers would be all over it as a
>> way to save money.
>> The rotational mass is often designed in to protect the drive train, in
>> particular the gearbox.
>> Read this:
>> https://www.netbug.net/blogmichael/2017/01/03/austin-healey-100-crank-failures/
>> Thirdly lightening a flywheel in of itself has very little effect on
>> acceleration.  An engine with a lightened flywheel may accelerate to 6000
>> RPM 1 - 2 seconds more quickly but that doesn't necessarily equate to 1-2
>> seconds faster to 60 MPH. You may be able to shift marginally faster if the
>> gearbox can stand the extra loads and the 4 to 5 pounds off vehicle weight
>> is really only the equivalent of half a tank of fuel. (Who ever notices
>> that their car accelerates more quickly with a half full gas tank).
>>
>> Just sayin'
>>
>> M
>>
>> On Tue., Sep. 7, 2021, 4:17 p.m. Earl Kagna via Healeys, <
>> healeys at autox.team.net> wrote:
>>
>>> I have Bill Bolton lightened flywheels in both my Healeys.  According to
>>> Kent Lambert, who took over Bills Healey business awhile back, the stock
>>> weight (6 cyl) is 28.5 pounds, and Bills machining program reduced them to
>>> 24.
>>>
>>>
>>>
>>> Both of my cars run just fine, no problems at all in the 20 + or so
>>> years that I’ve had them installed.
>>>
>>>
>>>
>>> Earl Kagna
>>>
>>> Victoria BC
>>>
>>> BJ8, BT7 tri-carb
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>> *From:* Healeys <healeys-bounces at autox.team.net> *On Behalf Of *richard
>>> mayor
>>> *Sent:* Tuesday, September 7, 2021 10:23 AM
>>> *To:* healeys <healeys at autox.team.net>
>>> *Subject:* [Healeys] Lightened flywheels
>>>
>>>
>>>
>>> 6 cylinder flywheels vary slightly but are all generally in the 29 pound
>>> range. Very aggressive machine work can get the weight down to the 22-23
>>> pound range.
>>>
>>> How much weight you take off will affect your driving style. To maintain
>>> the feel of a stock Healey while still improving the engines response, I
>>> suggest removing no more than 3 pounds.
>>>
>>>
>>>
>>> Richard
>>>
>>>
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-- 
Best--Michael
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